Refrigerating system



Patented Apr. 11, 1944 UNlTED STATES PATENT OFFICE REFRIGERATING SYSTEMFranklyn Y. Carter, Detroit, Mich, asslgnor to Detroit LubricatorCompany, Detroit, Mich a corporation of Michigan Application March 27,1942, Serial No. 436,408

3 Claims.

This invention relates to new and useful improvements in refrigeratingsystems and, more particularly, to a system including an evaporator forrefrigerating a water cooler.

In the refrigerating of water coolers which are positioned in a space orin an ambient medium having a temperature lower than the tem; peratureof the water cooling evaporator, it is necessary, when using athermostatic expansion valve of the gas-charged type, to provide meansto maintain control of the expansion valve in accordance with thetemperature of the evaporator outlet. Unless some such means isprovided, the limited volatile liquid charge in the power element bulbor feeler member will condense into the powerelement or tubing connectedto the bulb so that the expansion valve Y will be rendered inefie'ctive.

It is, accordingly, one object of this invention to provide means formaintaining the expansion valve in control of the admission ofrefrigerant to the evaporator.

The invention consists in the novel cooperative relation of parts to bemore fully described hereinafter and the novelty of which will beparticularly pointed out and distinctly claimed.

In the accompanying drawing to be taken as a part of this specificationthere is fully and clearly illustrated a preferred embodiment of theinvention, in which drawing:

Figure 1 is atop plan view of a water cooler having the inventionapplied'thereto, and

Fig. 2 is a view of the-water coolerpartly in section and shown asoperatively connected in arefrigerating system and positioned in arefrigerated space.

Referring to the drawing by characters of reference, l designates a roomor. chamber, such as a butcher box, wherein the interior space 2 isto bemaintained substantially at a water freezing temperature, say 32 to 32F. Positioned within the space 2 there is a water cooler 3 which may beof the drum type containing a copper coil evaporator 4 having an inlet 5and an outlet 6. A thermostatic expansion valve 1 which may be of any ofthe well known forms now on the market and which is of the gas-chargedtype controls the supply of refrigerant to the evaporator inlet 5. Thevalve 1 is fed from a refrigerant liquid line or conduit 8 which isconnected to the outlet of a compressor-condenser unit 9. From theevaporator outlet 6 a suction line or outlet conduit l0 connects to theinlet of the unit 9 so that a refrigerant circulatory system is a backpressure limiting valve II which is set to maintain the evaporatortemperature at a temperature above 32 F. and preferably in theneighborhood of 38 to 40 F. The interior of the cooler 3 is suppliedwith water from the usual "service main by a water inlet pipe I! whichhas a portion of its length, as at l3, wrapped around and in intimateheat exchange relation with the expansible hollow power element H of thevalve I. The supply pipe I! discharges into the interior of the cooler 3adjacent its bottom or lower end, as at IS. The power element It iscontrolled by a hollow temperature responsive bulb element It whichextends into the evaporator adjacent its outlet to the conduit l0 sothat it is in intimate heat exchange relation with the refrigerantleavmitting tube ll may have heat exchange contact therewithsubstantially at its point of leaving the evaporator outlet, as at l8.The tube I1 is wrapped around the pipe I2 or otherwise secured inintimate heat exchange relation therewith substantially to the point ofconnection of the tube II to the power element H. The tube ".and thepower element It will thus be warmed by the inflowing water in thesupply pipe II. The cooler 3 is provided with a water discharge pipe I!which may be provided with a faucet 20 and. if desired may lead outsideof the room i.

The operation of the system is as follows. When the faucet 20 is openedto draw water from the cooler 3, the volatile liquid may have condensedinto the tube H or power element ll so that the valve I will be held inclosed position. However, as soon as water is drawn from the cooler 3,warm incoming water will flow through the pipe l2, thereby raising thetemperature of the tube IT and the power element It so that volatfleliquid which may have condensed in the tube I1 and element It will nowbe vaporized. In normal operation, the water in the cooler 3 which is ata temperature below that of the warm incoming water in pipe I2 willcause at least a part of the volatile liquid vaporized in tube, II tocondense at the control point, namely in the bulb element it. It now thetemperature at the II outlet of the evaporator is above the desired tem-April 1944- H. H. CARY ETAL 2,346,470

METHOD OF MAKING GLASS ELECTRODES Filed Aug. 2, i940 J5 3 3 54 SW ll. mfi FOP THE 1-7)?!" A T TO ems KS.

